The guest described in detail seeing Omar Benguit plunge a knife into Jong-Ok Shin, 26.

But this version of what she saw appeared to clash with what she told a jury at the murder trial.

The Criminal Cases Review Commission has already watched footage of the Jeremy Kyle episode called “Years in hiding after I witnessed a murder” and has referred the case to the Court of Appeal, where judges will now study the programme.

The guest, identified only as “Bev”, said she was a heroin addict in 2002 when she gave a lift to three men, including Benguit, 40.

She pulled the car over and the men stepped out.

She said: “I got out of the car to see what was going on and as I looked around all I saw was the shadows of them, not clearly. I could see her and I saw Omar plunge a knife into her. She dropped down. I think he did it more than once.”

Previously she testified that she had simply heard a struggle. It took two hung juries and three trials before Benguit was convict-ed in 2005.

Kyle told her: “It took you five long years but you nailed this scumbag.”

The CCRC said: “The referral is based on new evidence, which potentially impacts on the reliability of a prosecution witness.”

There are other doubts over the safety of Benguit’s conviction for the murder in Bournemouth, Dorset, as she lived near murderer Danilo Restivo, 40.

He was jailed for life last year for killing a woman in the town at around the same time.